[Delphinus]

I'm not a tank builder so I could be wrong but I thought the space between the panes of glass was more structural, and it's the corner bead that prevents leaks. The silicone to glass bond is insanely strong. I think the bubbles probably don't affect the integrity of the tank - it just doesn't look very nice.

Man, I don't know what to suggest. I understand your frustration of "please just get this fixed" but rushing things now is a mistake.

It might be worthwhile at this point to take the tank out of the equation and continue with the build after possession. This lets the housebuilders painters etc finish their job and hopefully your possession date doesn't get pushed back. Then you can also investigate the silicone bubbles further and explore relevelling options and so on. This is your tank, after this much planning and anticipation, why accept anything less than perfect?

On the other hand though, part of me says if you pay a housebuilder to build a house, it comes with the expectation that they do the job right. Even if it pushes possesion back, this is their fault, not yours. I totally sympathize, we went through a lot of similar stuff when we built our house. It's brutal how much stuff is just eyeballed instead of properly measured.